Revolving hook for sewing-machines



(No Model.)

N WHEELER REVOLVING HOOK FOR SEWING MACHINES.

No. 420,847. Patented Feb. 4, 1890.

menfi c' 72 960170662 @M N as File a Lilhcgraphnn Washington. 0. C.

UNITED STATES PATENT OF ICE.

NATHANIEL IVHEELER, OF BRIDGEPORT, CONNECTICUT.

REVOLVING HOOK FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 420,847, dated February4, 1890.

Application filed October 18, 1889. Serial No. 327,446. (No model.)

To all whom it may concern:

Be it known that I, NATHANIEL \VHEELER, of Bridgeport, county ofFairfield, State of Connecticut, have invented an Improvement inRotaryHooks, of which the following description, in connection with theaccompanying drawings, is a specification, like letters and figures onthe drawings representing like parts.

This invention has for its object to improve the construction of thatclass of rotary hooks known as the Wheeler & WVilson,

I wherein the point of the hook takes a loop of needle-thread and castsit about a disk bobbin located at the face of the hook. In the class ofhook referred to, as now made, it sometimes happens that the needle,when the machine is run at very high speed, springs foward, so that thepoint of the hook strikes and breaks the needle. To obviate thepossibility of the needle getting into the way of the point of the hook,I have connected the body of the hook near the heel with the body of thehook at the base of the point by a bridge-piece, which is left extendedacross or around the usual open portion of the central cavity of thehook. This bridge, besides preventing the needle getting outside thepoint of the hook, also affords a more perfect support for the bobbinand prevents wear of the hook, as heretofore common.

The invent-ion consists in the combination and arrangement of partshereinafter more particularly described and claimed.

Figure 1 in front elevation shows a rotating hook embodying myinvention; Fig. 2, a top view of the hook shown in Fig. 1; Fig. 3 asection in the line 00, Fig. 1; and Figs. 4, 5, and 6 show like views ofthe usual rotating hook upon which my invention is an improvement.

In the drawings, a represents the hookshaft, and b the rotating hook,the hook having a point a, a heel d, and a central cavity 6.

Referring to Figs. 4 and 5, showing the old form of hook, it will beseen that there is an open space fbetween thepoint and heel of the hook,into which space the usual. eyepointed needle descends, and this spaceis in open communication with the central cavity 0 between the heel ofthe hook and the base of the point. The bobbin h rests in the concavityat the face of the hook and bears against the shoulders 2 8, and in usethese shoulders by contact with the bobbin are worn off, and theshoulders also Wear the bobbin, so that the latter wabbles in the hook;but, what is of greater moment, the needle, when the machine is run atvery high speed, is from various causes at times deflected into the openspace f between .the heel and point of the hook, such deflection beingsufficient to enable the point of the hook to get behind the needle,whereby the latter is quickly broken. and the bobbin injured.

To obviate the difficulties referred to, I have provided the rotary hookbetween the shoulders 2 3 (marked in Fig. 4) with a continuous bridge m,formed preferably as an integral part of the hook, said bridgeconnecting the hook near its heel with the hook near the base of itspoint, the said bridge crossing'the space f referred to and lying atthat side of the central cavity e at which the point and the heel of thehook lie, the said point, heel, and bridge being in substantially thesame vertical plane on that side of the hook nearest the needle, itbeing understood that the needle travels in a path behind the bridge andthe point of the hook, looking at the front view of the accompanyingdrawings. By

reason of this bridge it is impossible for the needle to be sprung ordeflected toward the bobbin far enough for the point of the hook to getbehind the needle, and the bridge keeps the bobbin upright, and thecorners2 3 being obviated the hook and bobbin are made more lasting.

In practice I find it of advantage to bend or incline the bridgebackward a little, as at 4, such bending of the bridge preventing anyoutward lateral movement of the needle before the point of the hookarrives opposite the needle. I do not, however, desire to limit myinvention to the exact shape shown for the bridge, as its shape might bevariously modified and yet prevent the needle from getting in front ofthe point of the hook. If the bridge extended for but part of thedistance across the space f between the heel and point, it would notproduce a hook possessing the same advantage as when the bridgecompletely spans the said space, for the reason that when the machine isrun at high speed the loop of needle-thread would be caught on theprojection. The inward bend of the bridge will preferably be such as tocorrespend with the bevel of the point of the usual needle.

I claim- 1. A shaft and a rotating hook thereon having a point and aheel separated by a space f and cavity 2, substantially as described,and connected by a bridge extended across the space and cavity andjoining the point and the heel, said point, heel, and bridge being insubstantially the same vertical plane on that side of the hook nearestthe needle to prevent the needle from being sprung or deflected towardthe hook far enough for the point of the hook to get behind the needle,substantially as and for the purpose set forth.

2. A shaft and a rotating hook thereon having a point and a heelseparated by a space f and cavity e, substantially as described, andconnected by a bridge slightly bent inwardly between its ends andextended across the space and cavity and joining the point and the heel,said point, heel, and bridge being substantially in the same Verticalplane and arranged on that side of the hook nearest the needle toprevent the needle frolnbeing sprung or deflected toward the hook farenough for the point of the hook to get behind it, substantially as andfor the purpose set forth.

I11 testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

NATHANIEL WI'IEELER. \Vitnoss-es:

ISAAC HOLDEN, Louis IL BAKER.

